Iron complexes, with cinnamaldehyde

Cinnamaldehyde complexes with iron, 12 246 Circular dichroism flavocytochrome b, 36 271 magnetic, see Magnetic circular dichroism Rieske and Rieske-type proteins, 47 113, 115-116... 

The copper(II) complex with polyaniline exhibits a higher catalytic capability for the dehydrogenation of cinnamyl alcohol into cinnamaldehyde [18, 20]. The cooperative catalysis of both components is achieved. Iron(lll) chloride is similarly employed instead of copper(II) chloride. The catalytic system is applicable to the decarboxylative dehydrogenation of mandelic acid to benzaldehyde. In these oxidation reactions, a complex catalyst consisting of polyaniline and metal salt forms a reversible redox cycle under molecular oxygen (Scheme 3.10). The copper salt appears to play a role as a metallic dopant, which is monitored spectroscopically. 

Tricarbonyliron diene complexes have found many uses in synthetic chemistry but their synthesis is often not easy. Knolker has developed a range of tricarbonyl(7] -l-aza-l,3-butadiene) iron complexes that are excellent transfer agents for the Fe(CO)3 complexation of 1,3-dienes, and showed their versatility. As an extension to this work, Knolker and Gonser have prepared a polymer-supported l-aza-l,3-butadiene 321 by reaction of Merrifield s resin with phenolic l-aza-l,3-butadiene 320, formed from cinnamaldehyde and /> ra-hydroxyaniline (Scheme 105). The corresponding tricarbonyl iron complex 322 was formed by treatment of 321 with an excess of Fe2(CO)9 in THF using ultrasound. The iron complex was subsequently used efficiently as a transfer agent for the tricarbonyliron complexation of 1,3-dienes. 

Iron pentacarbonyl reacts with cinnamaldehyde affording the complex 3.33, in which 77-bonding by both the C=C and C=0 systems has been proposed [84]. With acrolein and Mo(CO) , a polymeric complex, 3.34, is... 

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